The goal of this study is to evaluate interdialytic blood pressure changes of the patients in chronic hemodialysis. The main question to be answered is: What is the relative importance of weight gain, the renin angiotensin system, the sympathetic nervous system and inflammatory immune reactivity in the interdialytic hypertension of patients in chronic hemodialysis, The participants will have hemodynamic evaluation (cardiac output and peripheral vascular resistance) at the end of dialysis, ambulatory monitoring of blood pressure in the interdialytic period. Serum samples will be collected at the end of dialysis and before the start of the next dialysis, 2-3 days later.
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Cardiac Output
Timeframe: Each participant was studied once 1-3 hours after dialysis ended
Interdialytic Weight Change
Timeframe: Interdialytic weight change was studied once, by the difference between the weight at the end of dialysis and the weight 2-3 days later, before the next dialysis.
Systemic Vascular Resistance
Timeframe: Systemic vascular resistance was determined once in the participants 1-3 hours after dialysis